Governor for explosive engines



C. A. ROBERTSON GOVERNOR FOR EXPLOSIVE ENGINES May 3,

, Filed March 24, 1924 v 3 Sheets-Sheet 1 May 1927 c. A. ROBERTSON I GOVERNOR FOR EXPLOSIVE ENGINES :s Shets-Sheet 2 Filed March 24; 1924 Q NWMN MRNRQk 1,627,11 y 3,1927- -.A. RoB1-: 1soN 8 GOVERNOR FOR EXPLOSIVE ENGINES Filed March 24, 1924 a sheets-sheet a "a @a m M 8. W WM Patented May 3, 1927.

UNITED STATES CHARLES A. aoeanrs u, or. ebksom MICHIGAN, Assesses To MQNTGOMEBY WARD PATENT ounce.

eoymnivon r03 ExPLosrvn ENGINES. 7

Application filed March 24, 1834. Serial No. 701,260,

The present invention is related to internal combustion engines, and has particular reference to the speed governing devices thereof.

It has for' its general object theimprover ment of such devices by the provision of mechanism which is extremely sensitive to fluctuations in the engine speed, so that the engine is rendered more responsive to such fluctuations and uniformity of its speedpreserved. a a

A further; object sought to be attained. is the coordination and organization of" the parts in such manner'as'to reduce the number thereof to a minimum, with a resultant decrease in liability to damage, and necessity for replacement because ot'un'due wear. 3

The invention also has in View the in? corporation in a speed governor ofthe class referred to of means which can be readily manipulated without the exercise ofa high degree of skill, whereby to vary the effective adjustment of the elements through'the mediumoi which the speed is governed.

Other objects and advantages will appear,

as the nature of the improvements is better understood, the invention consisting substantially in the novel construction, combie nation and arrangement of parts hereinafter fully described, illustrated in the ac? companying drawings, and finally pointed out in the appended claims.

The disclosure ot the invention herein made is that of one practical"embodiment thereof. Obviously, it is susceptible 'to change and'variation in the form and arran gement of the structuralelements, so that the disclosure is not to be taken as imposing restriction or limitationupon the invention beyond that which its position the art e isa similar View on the lineberii,

Referring now in detail to the accom panymg drawmgs, and particularly to Fig;

1, in. which the engine in its, entirety is shown in plan view,'the numeral 10 desig nates' the frame of the engine, on Which is mounted a cylinder 11, in WlliChlS disposed the usnalpiston having driving relation to a. shaft 12 by the usual pitman ordriving rod 18. The shaft 12 bears a pair of fly wheels 14, and also connectedtosaid shaft 12'is a pinion 15whi'ch meshes with a timing gear 16. The exhaust valve mechanism is designated'bythe numeral 17, a sparkplug 18heing employed for igniting the explosive mixture, whichplug. is energizedby a. mag.-

neto 19 electrically. connected with said spark plug 18 by a suitableconductor 20.

The invention'is primarily concerned with the control :of the ignition mechanism as the means for regulating the speed of the engine. To this end, the invention contemplates the provision of instrumentalities by which the operation of the magneto v19 isjsupervi-sed so.

that'when the engine'has reached a maximum; speed such operat on may be so controlled as to prevent energizing ofthe spark plug'18, and thereby maintain the maximum speed or eiiect'a reduction in the speed. For this purpose the speed-governing mechanism is 'associatedwith the means for operating the magneto 19, the. latter being accomplishedbythe reciprocatory movement ota push rod 21 arrangedat one, side of the en gine and actingon a rocklever 252, by means otwhich the exhaust valve mechanism 17 is actuated; The movement of the push rod 21 is transmitted toithev trip mechanism 23 of the magneto 19 by a rocker arm 24 actuated in one direction by afspring 25 which encircles a contact sleeve 26, said sleeve and spring being interposed between the vertical member ofthe rocker arm 24 and a pair of locking. nuts 27 adjustably mounted on the push rod 21; pressed on movement of the rod 21 in the direction of the head of the engine cylinder,

the contact sleeve26 acting to initiate the Thespring 25 becomes comthrowing movement of the rocker arm 24 for releasing the trip mechanism 23,.the' spring 25 expanding to complete the. throwing movement of 'theroclier arm 24; When the contaetsleeve26' has pushed said rocker arm tofa predetermined point. The rocker arm 2st. is? react by a return spring. 28 which swings theatm 25% in. tlieopposite "directien on the reverse movement of the push rod 21. The rocker arm 24 in its relation to the trip mechanism 23 of the magneto 19, together with the springs 25 and 28 in their association and cooperation with said rocker arm 24, the sleeve 26, and the push rod 21, constitute a timing mechanism for the magneto which is made the subject of another application filed concurrently herewith, Serial No- 701,261, such timing mechanism being fully described and claimed therein, and no claim thereto is incorporated herein. operating the push rod 21 in one direction a timing cam 29 is employed. This cam is formed integral with the timing gear 16 at the inner face thereof, and about its hub portion, and its lobes are of such contour as to give the requisite reciprocation to the push rod 21, the latter being returned after reaching the limit of itsmovement in one direction by a return spring 30.. The cam 29 has frictional engagement with a contact roller 31 journalled on a screw threaded stud 32 having a head 33 which fits in a countersunk recess at the outer side of the roller 31, thereby holding the latter in rotative relation to an elongated guide plate 34. One end of the plate 34 is turned inwardly to provide an attaching head 35, to which is connected the screw threaded end of the push rod 21, the latter being held in locked relation to the attaching head 35-by a fastening nut 36. The

28 acting. in opposition to the cam 29, the.

forked end of the plate 34 moves within the flanges of the bushing 38, which, in turn, rotates with the cam 29 and the gear 16. This preserves the engaged relation of the plate 34 to the cam 29 for insuring proper operation of the latter on the roller 31. V

The timing gear 16 rotates on an outwardlydirected spindle 40 which is carried by a bearing stud 41 displaceably held in one side of the engine frame 10 by a set screw 42, held in adjusted position by a lock nut 43, the inner end of the screw 42v impinging against the inner end of the bearing stud 41. The spindle 40 is of less diameter than the stud 41,'so that a bearing shoulder 44 is formed at the innerend of the spindle 40, and the bushing 38 bears against said shoulder, and thus is prevented moving beyond a predetermined point inwardly of the stud 41...

At a point substantially midway the ends of the stud 41, and at its top portion, it is cut away to provide a diainetrical slot, and in proximity to this cut away portion of the stud 41 the side of the engine frame 10 has For.

horizontal flange 48 beingengaged, by an upwardly extending pin 50, carried bya governor .rod 51 which is slidably mounted in the bore of'the bearing stud 41. In the sliding movement of the rod 51, as will later appear, thepin 50 will move the abutment plate 47 towards'and away from the engine frame- 10, the plate swinging on itsvpivot 46, and

thereby the free end of said plate is p0sitioned for governing the movement of the push rod 21. For this purpose a contact button 51,,which is preferably in the form of a square disk, is d-etachably seatedin a countersunk recess 52 in the outer face of the vertical flange 49 of the contact plate 47, be-

ing held therein by a bolt 53 provided with a flared head which lies flush with the. outer surface of the button 51. The latter has at opposite faces complemental countersunk recesses 54, so that the button is reversible and when the edges thereof become worn it may be shifted in its position to present notonly a new 'edge:,of contact, but the faces thereof may be reversed in relation to the flange 49,

thereby prolonging the life of the button.

At the inner face of theguide plate 34 a supporting slide 55 is provided. This slide has a forked end in which is-fitted a contact button:56, similar in all respects tothe button 51. The slide 55 is adjustable with respect to the plate 34 by means of a fastening bolt 57 which fits within an. elongated slot 58, the end. of'the slide opposite to its forked end being turned inwardly to provide an engaging head 59 against which impinges the inner end of an adjusting screw 60. This screw is locked in its positions of adjustment by a nut 61. VViththe nut on the bolt 57 loosened, it is apparent that this bolt maybe adjusted along the slot 58, carrying. with it thesupporting plate 55, the adjustment of which may be effected by the proper..mauipulation of'the screw 60, and when the bolt 57 is clamped in adjusted positionin-its slot 58 the plate 55 will also be held in adjusted position. The contact button 56 is also held in adjusted position, both with respect to the supportingplate 55 and the guide plate 34, by a bolt 62, which fits within a slot 63 formed in said plate 34. The purpose of this is to permit proper adjustment of the button 56 so that its inner edge may contact with the outer edge of the button '51 carried by the abutment plate 47, and it is the purpose of the adjustable mountings of the bolts 57 and 62 to insure this proper contact of thebuttons 51" and 56. It will be understood, of course, that with the button 51- out ofalignment with the button 56, such contact does not take place, this relation of the parts being the button 51 and arrest such further movement of the push rod. The chest of this will presently appear.

At the outer face of the' timing gear 16 the same is provided with oppositely disposed pairs of spaced attaching cars 64. Between the ears of each pair is pivoted a weight 65, which constitutesan inertia element, a pin 66, or its equivalent, providing the pivot of each of these weights." The inner ends of the weights are provided withinwardly directed cam projections67, and said projections are designed to bear against a thrust washer 68 which is mounted on the governor rod 51. The inner face of this thrust washer is grooved transversely, L as at 69, and thus provides a guideway in of the timing gear 16, and thereby limit the inward movement of i the cam projections 67, and still preserve the parallel relation of the faces of the weights 65 with :the face of thegear 16.

During the rotation ofthe gear 16, when the same has attained a speed sufficiently great, centrifugal force will cause the weights 65 to swing ,on their pivots,- and move the cam projections67 outwardly, or away from the face of the t-iminggear 16. In this movement of the projections pressure is exerted against the thrust washer 68 and thegovernor rod 51 is thereby pulled outwardly, or in a direction away from the engine frame 10. Such movementswings the abutment plate 47 on itspivot 46, thereby aligning the contact button 51 with the contact button 56,- if the force exerted by the weights 65 is sufiicientf to" swing the abutment plate 47- tothat extent. Whenthe governor rod- 51 is so moved a coil spring 72 is compressed. This-springencirclesthe inner end of the rod 51, the inner endof said spring abutting against ahead 73 riveted, or otherwise secured" to said red. A bushing- 7 4- also encirclesthe inner end ofthe rod 51 and encases the spring 7 2',- the inner end of the latter abiitting against the inner end of the bushing-74. Tli liils'hiiig 74'is fitted within a socket 75 formed at the inner end'of the bearing stud 41, said bushing 74 having a flange 76 of greater diameter than the bore of the socket 75-. Thus it will be 'seen thatthe bushing 74 is restrained against inward movement, and as the rod 51 is drawn inwardly under the influence of the weights 65,- the head 73 compresses the spring 7 2, and this spring, therefore, resets the inward'movement of the rod 51. In thus becoming compressed the spring 72 will reactto draw therod 51 inwardly, or

towards the engine frame 10, when the speed ofthe wheel 16 has become reduced, and the inertia of the weights 65 overcome, and in such retraction of the rod 51 the abutment plate 47 will be drawn towardslthe engine frame, thus swinging the contact button 51 out of alignment with the contact button 56,whereupon the guide plate 34, impelled by thepush rod 21, may move to the full limit of its travel in the direction towards the driving shaft 12.-

For manually controlling the setting of the herein described governor mechanism to vary the'limits ofthe speed there is asso- 'cia-ted with the governor rod 51 and the flanged bushing 74 an adjusting slide 77.

This is in the form of a forked plate at the inner edge of eachleg of which is provided a wedge shapedflange 78 tapering from its upper end to the lower end thereof; The

legs of saidplate 77 are disposed between the flange 76 of the bushing 74 and the inner end of the bearing stud 41, as clearly illustrated in Figs. 2, 4-and 5-.- Fixedly connected to the upper end of the plate 77 is a handle member-'79 terminating in its upper end in a finger loop 80. The handle member 7 9' passes through'a slotted latch plate 81, which is connected to the'engine frame preferably by they setscrew 42' and its locking nut 43, i

by whichthe bearing stud 41 is heldin position: The handle member 7 9 is provided with a series of transverse corrugations 82 by which a series1olf'spacedribs is formed in said handle member, and said ribs are designed to engage the edges of the slotin thelatch plate 81, through which the handle member 79 is passed. This engagement holds the plat-e77 at different-elevations and thus determines-the degree of compression of the splin 72 effected by forcing the flange 76, oft e bushing 74 outwardly. Ob viously, when the slide plate 77 is in its uppermostpesitio'n no outward pressure is ex.

ertedon the bushing 74, and the spring 7 2 has the leastdegree of compression thereon.

.This is the low speed limit of the engine.

When the slide 77 is pushed downwardly to its-lowermost position the flanges 78, actihgas-c'anis', force the bushing 74 outwardly, thereby placingthe greatest degree of compressien as the spring 7 2. As-the spring 72 thus is highly. compressed, greater effort of the weights v65, in their outward movement, is necessary to overcome such compression, and in this lowermost position of the slide 77 the high speed limit of the engine is leached. If the handle member 7 9 be operated to move the plate 77 at any intermediate positions between the high and low limit of speed defined by the extreme travel of the plate 77, the speed of the engine is varied within these limits, and in accordance with the positioning of the slide 77.

In the light of the foregoing explanation the operation of the speed governing mechanism herein described will be readily under.- SLOOCl, and briefly described is as follows:

Assumingthe speed changing slide 79 'to be at its uppermost position, and the engine to be operating, the inertia elements are in their normal or retracted positions, and the abutment plate 47 is in such relation to theengine frame 10 that the contact button 51+ is out of alignment with the contact button 56. As the timing gear 16 rotates, the cam 29,,acting through the roller 31,

pushes the rod 21 in the direction of the head of the engine cylinder. The magneto 19 is actuated so as to produce a spark at the terminals of the spark plug 18, and the explosive'force of the combustible mixture thus imparts an impulse to the piston. If the speed of the engine increases, the weights 65 swing on their pivots,- thereby pulling the governor rod 51 outwardly and eventually swinging the abutment plate 47 also sufficiently outwardly to align the contact button 51 with the contactbutton 56. When this arises, movement of the push rod 21 under influence of the return spring 30 is arrested, and the push rod 21 thereafter is precluded actuating the magneto. No spark takes place, and this condition continues until the speed of the engine isreduced, whereupon the weights 65 approach their normal position, and in doing so the spring 72 expands to retract the governor rod 51.

This draws the abutment plate 17 inwardly towards the frame 10 and disaligns the contact buttons 51 and 56. The push rod 21 may now move to the extreme limit of its travel towards the engineshaft 12, thus permitting the magneto 19 again to be actuated when the rod 21 is moved in the opposite direction by the cam 29, and energizing the spark plug 18 to enable the engine to resume the speed for which it isset.

To vary the speed of the engine the speec changing slide 77 is positioned with respect to the flanged bushing 74 in the manner previously described, and at varying points be tween the extremes of movement of vthat slide, thereby imparting varying degrees of compression on the spring 72, and. thus requiring different degrees of pressure of 'the heights 65 on the rod 5lto swing the abutment plate a7,

The handle member 7 9 of the speed changing slide 77 passes upwardly through a slot 7 83 in a cover 84 which extends over, the crank case of the engine frame 10., This positions the finger loop in convenient location for ready access by the operator for adj ustment.

I claim:

1. In "a governor of the class described, the combination with the ignition mecha nism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of an abutment hingedly mounted with respect to the engine frame and adapted to be swung into the path of movement of said actuating means, whereby to arrest movement 1 of the latter and to prevent generation of the spark, a member slidably mounted and controlled by the speed of the engine for vswinging said abutmentinto engagement. with said actuatmeans when predetermined speed has been attained, and means for releasing the abutment from engagement with the actuating means when the speed has been reduced.

In a governor of theclass described, the combination with the ignition mechanism of an 'exploslveengine, and the actuating means thereof for effecting the genera tion of a spark thereby, of an abutment hingedly mounted with'respect to the engine frame and adapted to be swung into the path ofmovement of said actuating means, wherebyto arrest movement ofthe latter and to prevent generation of the spark, a member slidably mounted and controlled by the speed of the engine for swinging said abutment into. engagement with saidv actuating means when a predetermined speed has been attained, means for restraining movement of said slidable member, and means for actuating the slidable member controlled by the speed of the engine for swinging said abutment into engagement with the actu .ating'means when said predetermined speed has been attained.

3. In a governorof the class described,

the combination with the ignition mecha nism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of an abutment .hingedly mounted with respect ,to the engine frame and adapted to be swung into the path of movement of said actuating means,

whereby to arrest movement. of the latter and prevent generation of the spark, a member 'slidably mounted and controlled by the speed of the engine for swinging said abutment into engagement with said actuating means when apredetermined speed has been attained, means for actuating the slidable member controlled by the speed ofthe en gine for swinging said abutment into engagement with the actuating means when said predeterminedspeed' has been, attained,

and resilient means for rest aining move ment of said slidable member and for releasing the abutment from engagement with the actuating means when the speed has been reduced.

4:. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for elii'ectingthe generation of a spark thereby, of a swinging abutment associated with said actuatingmeans and cooperating therewith to arrest movement of the actuating means, whereby to prevent generation of the spark, means controlled by the speed of the engine for engaging said abutment with said actuating means when a predetermined speed has been attained, and means associated with said controlling means for varying the degree of its response to the speed of'theengine, whereby to vary the speed of the engine.

5. In a governor of the class described, the combination with the ignition mecha-. nism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of a swinging abut ment associated with said actuating means and cooperating therewith to arrest movement of the actuating means, whereby to prevent generation of the spark, means con trolled by the speed of the engine for engaging-said abutment with said actuating means when a predetermined speed has been attained, means associated with said con trolling means for varying the degree of'its response to the speed of the engine whereby to vary the speed of the engine, and means for releasing the abutment from engagement with the actuating means when the speed has been reduced. i

6. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of means cooperating with the actuating means to arrest move ment thereof, whereby to prevent genera tion of the spark, means controlled by the speed of the engine for engaging said arrestingmeans withsaid actuating means when a predetermined speed has been attained, and means associated with said controlling means for varying the degree of its response to the speed of the engine, whereby to vary the speed of the engine.

7. In a governor of the class described, the combination with the ignition mechanism of an'explosive engine, and the. actuating means thereof for effecting the generation of a spark thereby, of means cooperating with the actuating means to arrest movement thereof, whereby to prevent generation of the spark, means controlled by-the speed of the enginefor engaging saidarresting means with said actuating means when a predetermined speed has been attained, means associated with said controlling means for varying the degree of its response to, the speed of the engine, whereby to vary the speed of the engine, and means for releasing said arresting means from engagement with the acthereof, whereby to prevent generation of the spark, means controlled by the speed of the engine for engaging said arresting means with said actuating means when a prede- 'termined speed has been attained, and a manually operated device cooperating with said controlling means for varying the de gree of its response to the speed of the en- 'gine, whereby to vary the speed of the engine.

9. In a governor ofthe class described, the combination. with the ignition mechanism of an explosive engine, and the. actuating means thereof for effecting the generation of a spark thereby, of means cooperating with the actuating means to, arrest movement thereof, whereby to prevent generation of the spark, means controlled by the speed of the engine for engaging said arresting means with said actuating means when a predetermined speed has been attained, a manually operated device cooperating with said controll ng means forvarying the degree. ofits response to the speed of the engine, whereby to. vary the speed of the engine, and means for locking said manually operated device in its positions of adjustment.

10. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the generation of a sparkthereby, of means cooperating with the actuating means to arrestmovement thereof, whereby to prevent generation of] the spark, means controlled by the speedof the'engine for engaging said arresting means with said actuating means when a predetermined speed has been attained, a manually operated device cooperating with said controlling means, for varying the de gree of its response to the speed of the engine, whereby. to vary the speed of the engine, and means for releasing said arresting means from engagement withthe actuating means when the speed hasbeen reduced.

11. In a governor of the classdescribed, the combination with the ignition mechanism ofan explosive engine, and the a'ctn-atingmeans thereof foreffecting the genera tion of a spark thereby,.of means eooperab.

ing with the actuating means to arrest move- Lil) Cir

ment thereof, whereby to prevent generation of the spark, means controlled by the speed of the engine for engaging said arresting means with said actuating means when a predetermined speed has been attained, a manually 0 erateddevice cooperating with said contro ling means for varying the degree of its response to the speed of the engine, whereby to vary the speed of the engine, means for locking said manually operated device in its positions of adjustment, and means for releasing said arresting means from engagement with the actuating means when the speed has'been reduced.

12. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the genera tion of a spark thereby, of a swinging abutment associated with said actuating means and cooperating therewith to arrest movement of the actuating means, whereby to prevent generation of the spark, means con trolled by the speed of the engine for engaging said abutment with said actuating means when a predetermined speed has been attained, a manually controlledydevic'e cooperating with said controlling means for varying the degree of its response to the speed of the engine whereby to vary the speed ofthe'engine, and means for locking said manually operated device in its positions of adjustment.

13. In a governor of the class described,

the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the genera-' tion of a spark thereby, ofa swinging abutmentassociated with said actuating means and cooperating therewith to arrest move ment of the actuating means, whereby to prevent generation of the spark, a slidable 7 member controlled by the speed of the engine for swinging said abutment into engagement with said actuating means when a predetermined speed has been attained, a manually operated device cooperating with said slidable member and adapted to position the latter at diiferentpointsof responsiveness to the speed of the engine, whereby to vary the speed of theengine, and means for releasing'said arresting means from engagement with the actuating means when the speed has been reduced.

14;. In a governor of the class described, the combinatlon with the ignition mecha nism of an explosive engine, and the actuat ing means thereof'for effecting the generation of a spark-thereby, of a swinging abut-- ment associated with said actuating means and cooperating therewith to arrest movement of the actuating means, wherebyto prevent generation of the spark, a slidable member controlled by the speed of the engine for swinging said abutment into engagement with said actuating means when a predetermined speed has been attained, a manually'operated device cooperating with said slidable member and adapted to position the latter at difiierentpoints of responsiveness to the speed of the engine, whereby to vary'the speed of the engine, means for locking said manually operated device in its abutment mounted at the side of the engine frame and hingedlv connected't-hereto, said swinging abutment co-operating with said actuating means to arrest movement ofthe samewhen brought'into engagement there with, whereby to prevent generation of the spark, a hollow stud carried by the engine frame,a gearrotatably mounted thereon,a slidable member mounted in the bore of said stud and connected to said swingingabutment, means for actuating said shdable member to swing theabutment into engage: ment with said actuating means when a predetermined speed has been attained, and

means for releasing the abutmentfrom engagement with the actuating means when the speedof the engine has been reduced. i

16. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the generation of aispark thereby, of a swingingabutment mounted at the-side of the engine frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said actuating means to arrest movement of the same when brought into engagement therewith, whereby to prevent generation ofthe spark, a hollow stud carried by the engine frame, a rotating element mounted on said stud and actuated by the engine shaft, a slidable mem-' ber mounted in the bore'of said stud and abutment, means connected to said swingin carried by said. rotating element for actuating said slidable member to swing the abutment into engagement with said actuating means whena predetermined speed has been attained, and means for releasing the abutment from engagement with the actuating means when the speed of the engine has been reduced. V

17. Ina governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the generament mounted at the side of the engine,

frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said actuating means to arrest movement of the latter when brought into engagement therewith, whereby to prevent generation of the spark, a hollow stud carried by the engine frame, a rotating element mounted on said stud and actuated by the engine shaft, a slidable member mounted in the bore of said stud and connected to said swinging abutment, centrifugally-operating means carried by said rotating element for actuating said slidable member to swing the abutment into engagement with said actuating means when a predetermined speed has been attained, and means for releasing the abutment from engagement with the actuating. means when the speed of the engine has been reduced.

18. In a governor of the class described, the combination with the ignition mecha nism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of a swinging abutment mounted at the side of the engine frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said actuating means to arrest movement thereof when brought into engagement therewith, whereby to prevent generation of the spark, a hollow stud carried by the engine frame, a rotating element mountedon said stud and actuated by the engine shaft, a slidable member mounted in the bore of said stud and connected to said swinging abutment, means carried by said rotating element and con nected to said slidable member for actuating the latter to swing the abutment into engagement with said actuating means when a predetermined speed has been attained, and means also connected to said slidable memher and acting in opposition to the last mentioned means for releasing the abutment from engagement with the actuating means when the speed of the engine has been reduced.

19. In a governor of the class described, the combination with the ignition mechanism of an explosive engine, and the actuating means thereof for effecting the generation of a spark thereby, of a swinging abutment mounted at the side of the engine frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said actuating means to arrest movement thereof when brought into engagement therewith, whereby to prevent generation of the spark, a hollow stud carried by the engine frame, a rotating element mounted on said stud and actuated by the engine shaft, a slidable member mounted in the bore of said stud and connected to'said swinging abutment, means earned by said rotating element for actuatingsaid slidable member to swing the abutment intoengagement with said actuat ngmeans when a predetermined 1 speed of the engine.

20. In a governor of the class described,

the combination with the ignition mecha-' nism of an explosive engine, a push rod for actuating the same for efliectmg the generation of a spark thereby, a guide plate carried by said push rod, and a contact carried,

by said guide plate, of a swinging abutment mounted at the side of the engine frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said contact to arrest movement of the push rod when the abutment is brought into engagement with the contact, whereby to prevent generation of the spark, ahollow stud carried by the engine frame, a rotating element mounted on said stud and actuated by the engine shaft, a slidable member mounted in the bore of said stud and connected to said swinging abutment, means carried by said rotating element for actuating said slidable member to swing the abutment into engagement with said contact when a predetermined speed has been obtained, means for releasing the abutment from engagement with the contact when the speed of the engine has been reduced, and means co-operating with said slidable member to position the latter at different points of responsiveness to the speed of the engine, whereby to vary the speed of the engine.

21. In a governor of the class described,

the combination with the ignition mechanism of an explosive engine, a push rod for actuating the same for effecting the generation of a spark thereby, a guide plate carried by said push rod, and a contact carried by said guide plate, of a swinging abutment mounted at the side of the engine frame and having one of its ends hingedly connected thereto, the other end of said swinging abutment co-operating with said contact to arrest movement of the push rod when the abutment is brought into engagement with the contact, whereby to prevent generation of the spark, a hollow stud carried by the I engine frame, a gear mounted on said stud and rotatable with respect thereto, said gear being actuated by the engine shaft, a governor rod slidably mounted in the bore of said stud and connected to said swinging abutment, means carried'by said gear for actuating said governor rod to swing the abutment into engagement With said contact When a predetermined speed has been obtained, means for releasing the abutment from engagement with the contact When the speed of the engine has been reduced, and means co-operatlng wlth sa d governor rod to position'the latter at different points of responsiveness to the speed of the engine, whereby to vary the speed of the engine.

In testimony whereof I have hereunto signed my name. i

CHARLES A. ROBERTSON. 

